A small rubber rectangle fell out of my kick drum, i want to glue it back, but not sure where it goes exactly?

I was cleaning my drum kit before a client comes over tomorrow and performs on it, and when i turned over the kick pedal to wipe underneath it a small rubber rectangle fell on the ground. I think it fell off one other time long ago but it was still sticky and i put it back, but i don't remember where it goes and want to re-glue it.
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